Cross-Site Scripting Vulnerability in DOMPurify Affecting Cure53
CVE-2026-109345

5.1MEDIUM

Key Information:

Vendor

Cure53

Status
Dompurify
Vendor
CVE Published:
12 October 2026

What is CVE-2026-109345?

A cross-site scripting vulnerability exists in DOMPurify versions earlier than 3.4.16, allowing attackers to circumvent necessary sanitization measures. The vulnerability arises in IN_PLACE mode, where a force-removed style element retains its text content, which is susceptible to markup injection. Malicious actors can exploit this by injecting a style element that includes a closing style tag paired with an img onerror payload. This payload enables script execution during the serialization and re-parsing of the node, which poses a significant risk to web applications relying on DOMPurify for content sanitization.

Affected Version(s)

DOMPurify 0 < 3.4.16

DOMPurify 3.4.16

References

https://github.com/cure53/DOMPurify/security/advisories/G...
vendor-advisory
https://www.vulncheck.com/advisories/dompurify-before-3.4...
third-party-advisory

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

h-t-m
.